Process and plant for microbiological decontamination of contaminated soils

摘要

Environmentally friendly decontamination of contaminated soils is possible with a process and a plant in which the corresponding soil is removed from the ground, homogenised, screened and then fed to a reactor. Upstream of the reactor is connected a pressure lock via which the microorganisms required are introduced optimally, more precisely at a pressure significantly below 200 bar. The correspondingly inoculated soils are then introduced into a reactor where they are supplied with nutrients and moisture and adjusted to an appropriate temperature with slow mixing and corresponding transport in the direction of the discharge. As a result, optimum conditions for the microorganisms are created and maintained in the reactor. After the pressure decontamination, the soil leaves the reactor and is then subjected to roller compression under hydraulic load, whereupon the correspondingly produced mouldings are sanitised in a subsequent digestion. The purified material is then processed via fine screening to give cultivatable soil and either returned to the site of removal or stored for other applications. <IMAGE>